I have a set of slides taken back in 1998 with my Nikon F401 camera mostly taken with my then new 24 mm Nikkor lens. Unfortunately I was using two filters - being unaware that this causes vignette (well of course I know about the principal problem but the viewfinder did not show any - it hasn't got 100% - the 35-70 kit lens did not show vignette with two filters (UV+Cpol)). So many of those pics ended up with having quite severe vignette effects. Some of these have been scanned by me in the meantime, now I'm looking for a way to correct this flaw using my standard software GIMP. Since I right now have access to LINUX only PS is not an option. Searching the internet I found many tips on how to add a vignette to a picture with GIMP, but that is not what I wanted, i want to flatten my vignetted pics - no information found. If anybody knows how to do it under GIMP, I would be glad if you could share this information. Thanks.